public jmp_network FindBytime(string start, string end)
{
var where = new List <string>();
if (!string.IsNullOrEmpty(start))
{
where.Add("convert(varchar(10),n_time,120)>='" + start + "' ");
}
if (!string.IsNullOrEmpty(end))
{
where.Add("convert(varchar(10),n_time,120)<='" + end + "' ");
}
return(_repository.FindBytime(string.Join(" AND ", where)));
}